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user configurable relay-only MTA - the regular MTA

ESMTP is a user configurable relay-only Mail Transfer Agent (MTA) with a
sendmail-compatible syntax. It's based on libESMTP supporting the AUTH
(including the CRAM-MD5 and NTLM SASL mechanisms) and the StartTLS SMTP
extensions.

ESMTP does not receive mail, expand aliases or manage a queue but can deliver
mail locally via an MDA.